Answer:
18 kg * m/s
Explanation:
The equation for momentum is:
momentum = mass * velocity
And although the problem already gave velocity, you must calculate the mass from the graviational force.
Fg = 3.4N = mg = 9.8m
mass = 3.4 N / 9.8 m/s^2 = 0.3469 kg
Momentum = 52m/s * 0.3469 kg - 18.041 kg * m/s = 18